A micro fan is provided. The micro fan includes a rotor and a stator. The stator includes an axial induced coil unit and a circuit board. The axial induced coil unit is made by twining a coil in an axial direction for at least two layers and in a radial direction for at least two layers.

An electric machine includes a rotor extending along an axis and a stator lamination stack radially spaced from the rotor. The stator lamination stack has circumferentially spaced teeth defining gaps therebetween. The electric machine also includes a coil winding disposed in the gaps between the circumferentially spaced teeth and a guard plate disposed at one of the first and second stator ends. The guard plate extends radially away from the axis and includes a plurality of teeth guards extending radially, with each of the teeth guards aligned with one of the teeth of the stator lamination stack to electrically insulate the coil winding from the teeth of the stator lamination stack. The plurality of teeth of the stator lamination stack extend radially inward toward the axis and the teeth guards of the guard plate extend radially inward toward the axis.

The disclosure relates to a method for producing a stator, where, for one or both layers of a two-layer winding, a tool with receiving regions is respectively provided on an end face of a laminated core. A relative arrangement of the receiving regions corresponds to a relative end position for conductor ends of the conductor elements. In a positioning process, the tool is moved into a first turning position and each conductor end of a first group of the conductor elements is respectively inserted into one of the receiving regions. Then the tool is turned into at least one further turning position and each conductor end of a further group of the conductor elements is respectively inserted into one of the receiving regions until the conductor ends of all the conductor elements of the layer are in the relative end position in relation to one another.

A micro fan is provided. The micro fan includes a rotor and a stator. The stator includes an axial induced coil unit and a circuit board. The axial induced coil unit is made by twining a coil in an axial direction for at least two layers and in a radial direction for at least two layers.

A rotating electrical machine that includes a rotor core; a stator core disposed so as to face the rotor core in a radial direction and including a plurality of teeth and a plurality of slots each located between adjacent ones of the teeth; and a concentric coil formed by concentrically winding a wire, and including a slot accommodated portion placed in the slot of the stator core and a coil end portion projecting in an axial direction from the stator core, wherein of the slot accommodated portion of the concentric coil, an axial end of the slot accommodated portion located on a side facing the rotor core is located closer to an outside in the radial direction than an axial middle part of the slot accommodated portion located on the side facing the rotor core.

A method and an apparatus for compact insertion of thick wire multiphase pseudo helical wave winding into a ferromagnetic core of an electrical machine, achieving high fill factor of the core slots, resulting in better heat transfer between the winding and the core, low mass and volume, and overall higher efficiency of electrical machine. An apparatus being fully programmable and physically adaptable to wide range of electric machine dimensions, where process is automated, simple, accurate, reliable and quick, while being suitable for mass production.

The disclosure relates to a method for producing a winding of a winding carrier of an electric machine. The method includes providing a laminated core. The laminated core has an axis and a first slot for accommodating a first winding segment for producing the winding. The first slot extends in the direction of the axis. The first slot is arranged on a first circle as viewed in the direction of the axis, through the circle center point of which first circle the axis extends. The method includes: arranging the first winding segment in the first slot, where a first region of the first slot protrudes from the laminated core; and bending the first region by applying a first force acting in the direction of the axis and by applying a first force acting tangentially to the first circle onto the first region in a first direction tangentially to the first circle.

A method of manufacturing an armature coil includes the steps of: stacking multiple armature coils to generate a stack of armature coils in a stacking direction as a first step; securing first and second ends of the stack of armature coils with a pair of clamping dies, respectively, as a second step after completing the first step; and sandwiching and depressing the stack of armature coils with pressing die in a given direction intersecting the stacking direction as a third step after completing the second step. The pressing die includes a pair of sandwiching dies to sandwich and depress the stack of armature coils in the given direction. The pair of sandwiching dies has a narrower interval at a position closer to a first end of the stack than that at another position closer to a second end thereof.

A control device moves a split claw (11) holding a projecting portion (4d) of an eighth-layer coil segment (4) in a counterclockwise direction D1. At this time, the control device moves first to third extended blades (13a) to (13c) in an outward direction D3 so that the projecting portion (4d) of the eighth-layer coil segment (4) is bent in the outward direction D3. Then, the control device moves the first to third extended blades (13a) to (13c) in an inward direction D4. Through the above steps, the projecting portion (4d) of the eighth-layer coil segment (4) is bent in the counterclockwise direction D1 while being bent in the outward direction D3. As a result, a return force tending to return in the inward direction D4 is generated by an elastic deformation force.

In this stator core, the interval in the circumferential direction of the stator core between an outer peripheral surface of an axial end of a slot accommodated portion of a concentric coil and a tooth facing the outer peripheral surface is larger than the interval in the circumferential direction of the stator core between an inner peripheral surface of the axial end and a tooth facing the inner peripheral surface.